/*
 * Copyright (c) 2016-2088, fastquery.org and/or its affiliates. All rights reserved.
 *
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * 
 * For more information, please see http://www.fastquery.org/.
 * 
 */

package org.fastquery.dialect;

import java.sql.Connection;
import java.sql.DatabaseMetaData;
import java.sql.SQLException;

import org.fastquery.core.QueryContext;
import org.fastquery.core.RepositoryException;
import org.fastquery.page.PageDialect;

/**
 * 
 * @author mei.sir@aliyun.cn
 */
public class DialectScheduler {
	
	private DialectScheduler() {
	}

	public static PageDialect getCurrentPageDialect() {
		Connection conn = QueryContext.getConn();
		String dbProductName = "";
		try {
			DatabaseMetaData metaData = conn.getMetaData();
			dbProductName = metaData.getDatabaseProductName();
			if ("MySQL".equals(dbProductName)) {
				return MySQLPageDialect.getInstance();
			} else if ("PostgreSQL".equals(dbProductName)) {
				return PostgreSQLPageDialect.getInstance();
			} else {
				return DefaultPageDialect.getInstance();
			}
		} catch (SQLException e) {
			throw new RepositoryException(e);
		}
	}
	
}
